|This article is about Zero, the larval stages of Kihunter. For Samus's tight blue, un-powered suit, see Zero Suit.|
Zero are worm-like creatures and larval stages of Kihunters. Like Kihunters, their origins, whereabouts, and other details are sketchy and vague. It is unknown what their planet of origin is, but Zero appear on Zebes' Brinstar jungle area. Zero have yet to appear on any other planet. Despite this, the Galactic Federation was able to obtain the genetic makeup of Zero and used it to clone them in the Bottle Ship and again in the B.S.L research station. After a certain trigger, Zero enter a pupa-like stage. They then eclose into adult Kihunters.
Zero first appeared in Brinstar after Samus had obtained certain upgrades. The creatures appear to have recently shed skins or hatched from sacs of some sort; they emerge from a brown-tinted film of skin resembling their own. Green Zero will crawl around walls and ceilings, damaging Samus if she comes into contact with them. In Super Metroid, there is no evidence that Zero are related to Kihunters.
Metroid: Other M
Considering that Zebes was destroyed in Super Metroid, the Galactic Federation seems to have used either DNA of Kihunters from Samus's Power Suit or found Kihunter DNA on another planet. The latter is more likely than the first, considering Kihunters are from distant plantes. These Zero seem to have been considerably enhanced by the Bottle Ship's crew. Bottle Ship Zero's shells are much more resilient than regular Zero, best taken down by Samus's Morph Ball Bombs. After taking a blast from a Bomb, Zero will be flipped upside down and will be much more vulnerable. Zero attack by jumping toward Samus, normal contact also damages her.
If left undisturbed, set Zero will pupate and encase themselves in a cocoon. After entering the pupa form, Zero will instantly become Kihunters. Regardless of whether Samus destroys the cocoons or the Kihunters break the cocoons themselves, an unarmored Kihunter will emerge from the cocoon. Even if Samus destroys a freshly formed cocoon, an adult Kihunter will emerge, suggesting that Kihunters are cramped within Zero's bodies and their shells form the cocoon.
The Federation kept Kihunters and Zero in the B.S.L station. Zero reside in Sector 2 (TRO), the tropical section of Biologic's research station. While the Zero here may or may not have been enhanced by Biologic's researchers, the Zero themselves are not actually faced by Samus. Instead, their X-mimicked variants roam SRX.
Zero-X have been changed from green to red in coloration. These are much more resilient then Zero faced before, and take many more shots to kill. Additionally, Zero-X will speed up and charge toward Samus if she attacks them. There are also blue variants of Zero-X, which are still more powerful. These X-mimicked creatures are able to withstand an obscene amount of damage, withstanding many charged shots and Missiles. Blue Zero-X are often the result of Red X taking over a Zero, and will yield the rare, Red X if destroyed.
Super Smash Bros. for Wii U
- Ironically, most X taking over Zero will result in the Zero turning red, but a Red X taking over a Zero will result in a Zero turning blue.
Zero life cycles are analogous to those of butterflies, where Zero resemble the caterpillar stage and Kihunters the butterfly. Aside from both caterpillars and Zero being the larva stage of their respective life cycles, Zero move by contracting their bodies much like caterpillars.
The name Zero could be a reference to their weak power. It could also be a reference to their minimal stage in the Kihunter life cycle.